netdev - Re: [PATCH v3 01/55] netfs: Fix netfs_extract_iter_to_sg() for ITER

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Date:   Fri, 31 Mar 2023 15:05:55 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        Christian Brauner <brauner@...nel.org>,
        Chuck Lever III <chuck.lever@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        netdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Steve French <sfrench@...ba.org>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Rohith Surabattula <rohiths.msft@...il.com>,
        linux-cachefs@...hat.com, linux-cifs@...r.kernel.org
Subject: Re: [PATCH v3 01/55] netfs: Fix netfs_extract_iter_to_sg() for
 ITER_UBUF/IOVEC

On Fri, 2023-03-31 at 17:08 +0100, David Howells wrote:
> Fix netfs_extract_iter_to_sg() for ITER_UBUF and ITER_IOVEC to set the size
> of the page to the part of the page extracted, not the remaining amount of
> data in the extracted page array at that point.
> 
> This doesn't yet affect anything as cifs, the only current user, only
> passes in non-user-backed iterators.
> 
> Fixes: 018584697533 ("netfs: Add a function to extract an iterator into a scatterlist")
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Jeff Layton <jlayton@...nel.org>
> cc: Steve French <sfrench@...ba.org>
> cc: Shyam Prasad N <nspmangalore@...il.com>
> cc: Rohith Surabattula <rohiths.msft@...il.com>
> cc: linux-cachefs@...hat.com
> cc: linux-cifs@...r.kernel.org
> cc: linux-fsdevel@...r.kernel.org
> ---
>  fs/netfs/iterator.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c
> index e9a45dea748a..8a4c86687429 100644
> --- a/fs/netfs/iterator.c
> +++ b/fs/netfs/iterator.c
> @@ -139,7 +139,7 @@ static ssize_t netfs_extract_user_to_sg(struct iov_iter *iter,
>  			size_t seg = min_t(size_t, PAGE_SIZE - off, len);
>  
>  			*pages++ = NULL;
> -			sg_set_page(sg, page, len, off);
> +			sg_set_page(sg, page, seg, off);
>  			sgtable->nents++;
>  			sg++;
>  			len -= seg;
> 

Reviewed-by: Jeff Layton <jlayton@...nel.org>